printouts about removable disk in the kernel log

printouts about removable disk in the kernel log

[Alexey Orishko]

Hi guys,

Sorry, if I'm off topic/wrong email list..
I'm using kernel 3.18.11 kernel with log level 3 and I wonder what module/driver
spamming kernel log with messages like:
...
[333670.400456]  sdc: sdc1
[333681.164482]  sdc: sdc1
[333703.092187]  sdc: sdc1
[333735.383544]  sdc: sdc1
[333745.723305]  sdc: sdc1
[333767.222874]  sdc: sdc1
[333777.664778]  sdc: sdc1
...
[334196.922476]  sdc: sdc1
[334203.111184] sdc: detected capacity change from 80022167552 to 0
[334203.113963] ata4: exception Emask 0x10 SAct 0x0 SErr 0x4010000
action 0xe frozen
[334203.113965] ata4: irq_stat 0x00400040, connection status changed
[334203.113968] ata4: SError: { PHYRdyChg DevExch }
[334203.113976] ata4: hard resetting link
[334203.836637] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
..

When a removable disk is connected, kernel log is overwhelmed with
messages about
disk and its partition like in example above. Messages in the kernel
log stop after disk
was removed (ejected). The messages are not really informative and I
wonder if they can be
switched off.

It is difficult to find this message in the kernel code, since based
on the the look it is
most likely containing only arguments to print function.

Does anyone know the origin of such messages so they can be removed?

Regards,
Alexey

Re: printouts about removable disk in the kernel log

[Tim Small]

On 28/04/15 16:49, Alexey Orishko wrote:

> [334203.113976] ata4: hard resetting link
> [334203.836637] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
> ..
> 
> When a removable disk is connected, kernel log is overwhelmed with
> messages about
> disk and its partition like in example above. Messages in the kernel
> log stop after disk
> was removed (ejected). The messages are not really informative and I
> wonder if they can be
> switched off.


Doing something like:

echo 1 > /sys/block/sdc/device/delete

prior to unplugging the drive will reduce messages on unplug (and will
also spin down the disk etc.).  On some kernel versions it will also
stop the kernel speed limiting the interface (if that's a concern).

Personally I use something like "logcheck" to handle this sort of thing,
and add exclusion patterns for stuff I don't want to hear about.

Tim.

Re: printouts about removable disk in the kernel log

[Alexey Orishko]

On Thu, Apr 30, 2015 at 11:49 AM, Tim Small <tim@seoss.co.uk> wrote:
> Doing something like:
>
> echo 1 > /sys/block/sdc/device/delete
>
> prior to unplugging the drive will reduce messages on unplug (and will
> also spin down the disk etc.).  On some kernel versions it will also
> stop the kernel speed limiting the interface (if that's a concern).

Well... it will kill that block device completely. If you are removing
hard disk connected to sata controller directly, it would do. However
in case of dock with a disk cartridge, dock becomes nonoperational due
to missing driver.


/alexey